Use version namespace in normal mode

[Jonathan Wakely]

On 21/10/16 21:21 +0200, François Dumont wrote:
>Hi
>
>    I configured libstdc++ to use gnu-version-namespace and there are 
>a number of failures, see below. But none of them related to this 
>patch so is it ok to commit ?

Yes, OK to commit - it doesn't make the test results any worse than
they were before :-)

And I agree it is wrong for the containers to not be in the versioned
namespace, so this fixes it - thanks for cleaning it up.